I don't know alot about them other than what I wrote. I thought maybe some of out fellow shipmates from down under might have more information on them.
Can only help with the fact they are in QLD Brisbane area.
Forgot to add & if it's the same one the Yam was constructed in the late 70's by a bloke in his garage, why because he wanted something bigger.
An Enterprize at 17'+ was also being cut out of plywood about that time
Tony